// Copyright (c) 2007-2008 Simon Fell
//
// Permission is hereby granted, free of charge, to any person obtaining a 
// copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included 
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
// THE SOFTWARE.
//

#import "Pool.h"


@implementation Pool

- (id)initWithMaster:(id)masterObject maxPoolItems:(int)max {
	self = [super init];
	spares = [[NSMutableArray arrayWithCapacity:max] retain];
	maxToKeep = max;
	master = [masterObject retain];
	return self;
}

- (void)dealloc {
	[master release];
	[spares release];
	[super dealloc];
}

- (id)checkout {
	id spare = nil;
	@synchronized (spares) {
		if ([spares count] > 0) {
			spare = [spares lastObject];
			[spares removeLastObject];
		}
	}
	if (spare == nil) {
		@synchronized (master) {
			spare = [master copyWithZone:nil];
		}
	}
	return spare;
}

- (void)checkin:(id)item {
	@synchronized (spares) {
		if ([spares count] < maxToKeep)
			[spares addObject:item];
	}
}

@end
